译密码-while()结构

#include <stdio.h>

int main() {
    char c;
    while ((c = getchar()) != '\n') {
        if ((c >= 'a' && c <= 'z')
                || (c >= 'A' && c <= 'Z')) {
            c = c + 4;
            if (c > 'Z' && c <= 'Z' + 4 || c > 'z')
                c = c - 22;
        }
        printf("%c", c);
    }
    printf("\n");
    return 0;
}